Instantiating an struct defined as DNVSRISKMDECORE!STRUCT1

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Marek - 05 Mar 2008 12:12 GMT

Hi
I am trying to call a method in a FORTRAN.NET assembly that requires a
structure parameter. Intellisense tells me that the structure name is
DNVSRISKMDECORE!STRUCT1 and this is confirmed by reflector. However in the
C#, declaring an object of type DNVSRISKMDECORE!STRUCT1 is rejected because
of the ! mark.

Please could anyone help?

Best regards

Marek

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Ben Voigt [C++ MVP] - 05 Mar 2008 19:39 GMT

> Hi
> I am trying to call a method in a FORTRAN.NET assembly that requires a
[quoted text clipped - 6 lines]
>
> Please could anyone help?

From the C# specification: "Unicode escape sequences are permitted in
identifiers".

So use the following name:

DNVSRISKMDECORE\u0021STRUCT1

> Best regards
>
> Marek

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Marek - 06 Mar 2008 07:42 GMT

Hi Ben
Not sure if I understood or not, but using the name you suggested the
compiler complains:

error CS1056: Unexpected character '\u0021'

Best regards

Marek

> > Hi
> > I am trying to call a method in a FORTRAN.NET assembly that requires a
[quoted text clipped - 17 lines]
> >
> > Marek

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Willy Denoyette [MVP] - 06 Mar 2008 09:01 GMT

Punctuator characters are not allowed in identifiers (see ECMA-335 ch
8.5.1), so, ! is not allowed and as \U0021 is exactly the same a s !, the
compiler complains in both cases with the same error.
AFAIK, punctuations are not allowed in Fortran, so I doubt this is the real
class name you are referring to.
If Fortran.net does allow such names on public interfaces, then is violates
the above mentioned CLS rules.

Willy.

> Hi Ben
> Not sure if I understood or not, but using the name you suggested the
[quoted text clipped - 27 lines]
>> >
>> > Marek

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Jon Skeet [C# MVP] - 06 Mar 2008 08:22 GMT

> I am trying to call a method in a FORTRAN.NET assembly that requires a
> structure parameter. Intellisense tells me that the structure name is
[quoted text clipped - 3 lines]
>
> Please could anyone help?

Unfortunately that name violates CLS rule 4. I'd expect quite a few
languages to have issues consuming it.

You may be forced to use reflection in order to access it from just C#.
If you have to use it a lot, you may be able to create your own
structure (probably using ILDASM/ILASM) which mirrors the existing
structure, and has conversion methods to/from the Fortran one. With
that in place, you'd never need to actually specify the name in C#
code. It's a really ugly solution though.

Signature

Jon Skeet - <skeet@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
World class .NET training in the UK: http://iterativetraining.co.uk

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Marek - 06 Mar 2008 09:13 GMT

Hi Ben, Willy and Jon
Thanks for all your replies. I was worried that you were going to say that.
Our requirement is to call a method that uses this object so I can get away
with creating and using the object as follows:

Type struct1Type = assembly.GetType("DNVSRISKMDECORE!STRUCT1");
object struct1Instance = Activator.CreateInstance(struct1Type);

struct1Type.InvokeMember("iint1", BindingFlags.SetField, null,
struct1Instance, new object[] { -1 });
struct1Type.InvokeMember("iint2", BindingFlags.SetField, null,
struct1Instance, new object[] { -2 });
struct1Type.InvokeMember("ddouble1", BindingFlags.SetField,
null, struct1Instance, new object[] { -10.0 });
struct1Type.InvokeMember("ddouble2", BindingFlags.SetField,
null, struct1Instance, new object[] { -20.0 });

Thanks for your responses.

Best regards

Marek

> > I am trying to call a method in a FORTRAN.NET assembly that requires a
> > structure parameter. Intellisense tells me that the structure name is
[quoted text clipped - 13 lines]
> that in place, you'd never need to actually specify the name in C#
> code. It's a really ugly solution though.

Reply to this Message

Jon Skeet [C# MVP] - 06 Mar 2008 09:20 GMT

> Thanks for all your replies. I was worried that you were going to say that.
> Our requirement is to call a method that uses this object so I can get away
[quoted text clipped - 13 lines]
>
> Thanks for your responses.

Do you only have to do this once? If so, that's a reasonable workaround
(horrible as it is that you have to do it). If you need to use it more
often, I'm happy to help you with the alternative idea about a
surrogate structure.

Signature

Jon Skeet - <skeet@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
World class .NET training in the UK: http://iterativetraining.co.uk

Reply to this Message

Marek - 06 Mar 2008 09:32 GMT

Hi Jon
Thanks for the offer. I did dabble with Reflector yesterday, which did show
how to create the object using:

[StructLayout(LayoutKind.Explicit, Size=0x18, Pack=8), DebugInfo(new byte[] {
0x69, 0x69, 110, 0x74, 0x31, 0, 0x20, 0, 0, 0, 4, 0, 0, 0, 0x10, 0,
0, 0, 4, 0, 0, 0, 0x69, 0x69, 110, 0x74, 50, 0, 0x20, 0, 0, 0,
4, 0, 0, 0, 20, 0, 0, 0, 4, 0, 0, 0, 100, 100, 0x6f, 0x75,
0x62, 0x6c, 0x65, 0x31, 0, 0x20, 0, 0, 0, 11, 0, 0, 0, 0, 0, 0,
0, 8, 0, 0, 0, 100, 100, 0x6f, 0x75, 0x62, 0x6c, 0x65, 50, 0, 0x20, 0,
0, 0, 11, 0, 0, 0, 8, 0, 0, 0, 8, 0, 0, 0, 0, 0
})]
public struct DNVSRISKMDECORE!STRUCT1
{
// Fields
[FieldOffset(0)]
public double ddouble1;
[FieldOffset(8)]
public double ddouble2;
[FieldOffset(0x10)]
public int iint1;
[FieldOffset(20)]
public int iint2;
}

The good news for me is that because of our application design, all the
methods and objects (lots of) are stored on a data dictionary and they are
built using the late invocation approach anyway.

Thanks again.

Best regards

Marek

> > Thanks for all your replies. I was worried that you were going to say that.
> > Our requirement is to call a method that uses this object so I can get away
[quoted text clipped - 18 lines]
> often, I'm happy to help you with the alternative idea about a
> surrogate structure.

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Instantiating an struct defined as DNVSRISKMDECORE!STRUCT1

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